Total Purchase Consideration for the PlaySpan Acquisition (Parenthetical) (Detail) (Play Span Inc, Potential Purchase Consideration, USD $) In Millions	Mar. 01, 2011
Business Acquisition [Line Items]
Earn-out provision	$ 40	[1]
Maximum
Business Acquisition [Line Items]
Earn-out provision	$ 40

[1] The acquisition agreement includes a potential earn-out provision of up to $40 million, should PlaySpan achieve certain revenue targets and other milestones.